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a) \(x^2-6x+xy-6y\)
\(=\left(x^2-6x\right)+\left(xy-6y\right)\)
\(=x\left(x-6\right)+y\left(x-6\right)\)
\(=\left(x-6\right)\left(x+y\right)\)
c) \(3x^2-7x+4\)
\(=3x^2-3x-4x+4\)
\(=\left(3x^2-3x\right)-\left(4x-4\right)\)
\(=3x\left(x-1\right)-4\left(x-1\right)\)
\(=\left(x-1\right)\left(3x-4\right)\)
\(3x^2-6xy+3y^2-12z^2\)
\(=3\left(x^2-2xy+y^2\right)-3\cdot4z^2\)
\(=3\left(x-y\right)^2-3\cdot4z^2\)
\(=3\left(x-y-2z\right)\left(x-y+2z\right)\)
a , 3x2 + 3y2 - 6xy - 12
= 3 ( x2 + y2 - 2xy - 4 )
= 3 ( x - y )2 - 22
= 3 ( x - y + 2 ) ( x - y - 2 )
\(3y^3+6xy^2+3x^2y=3y\left(y^2+2xy+x^2\right)=3y\left(x+y\right)^2\)
\(x^3-3x^2-4x+12=x^2\left(x-3\right)-4\left(x-3\right)=\left(x-3\right)\left(x^2-4\right)=\left(x-3\right)\left(x-2\right)\left(x+2\right)\)
\(x^3+3x^2-3x-1=\left(x-1\right)\left(x^2+x+1\right)+3x\left(x-1\right)=\left(x-1\right)\left(x^2+x+1+3x\right)\)
\(=\left(x-1\right)\left(x^2+4x+1\right)\)
Tham khảo nhé~
\(3\left(x^2-2xy+y^2-4z^2\right)\)
\(\:dong3\\ =2x^2+3x-2-3=2 x\left(x-1\right)+3\left(x-1\right)=\left(2x+3\right)\left(x-1\right)\)
\(2x^2-18=2\left(x^2-9\right)\)
\(x^2-7xy+10y^2=\)
a) \(x^3-4x^2-9x+36\)
\(=x^2\left(x-4\right)-9\left(x-4\right)\)
\(=\left(x-4\right)\left(x^2-9\right)\)
\(=\left(x-4\right)\left(x-3\right)\left(x+3\right)\)
b) \(3x^2-6xy+3y^2-12z^2\)
\(=3\left(x^2-2xy+y^2-4z^2\right)\)
\(=3\left[\left(x^2-2xy+y^2\right)-4z^2\right]\)
\(=3\left[\left(x-y\right)^2-\left(2z\right)^2\right]\)
\(=3\left(x-y-2z\right)\left(x-y+2z\right)\)
g) \(5x^2-10xy+5y^2-20z^2\)
\(=5\left(x^2-2xy+y^2-4z^2\right)\)
\(=5\left[\left(x^2-2xy+y^2\right)-4z^2\right]\)
\(=5\left[\left(x-y\right)^2-\left(2z\right)^2\right]\)
\(=5\left(x-y-2z\right)\left(x-y+2z\right)\)
\(x^2-2xy+y^2-z^2=\left(x-y\right)^2-z^2=\left(x-y-z\right)\left(x-y+z\right)\)
\(3x^2+6xy+3y^2-3z^2=3\left(x^2+2xy+y^2-z^2\right)=3.\left[\left(x+y\right)^2-z^2\right]=3.\left(x+y-z\right)\left(x+y+z\right)\)
\(3x^2-3xy-5x+5y=3x\left(x-y\right)-5\left(x-y\right)=\left(x-y\right)\left(3x-5\right)\)
a) 5x2 - 5xy + 7y - 7x = ( 5x2 - 5xy ) - ( 7x - 7y ) = 5x( x - y ) - 7( x - y ) = ( x - y )( 5x - 7 )
b) x2 - y2 + 2x + 1 = ( x2 + 2x + 1 ) - y2 = ( x + 1 )2 - y2 = ( x - y + 1 )( x + y + 1 )
c) 3x2 + 6xy + 3y2 - 3z2 = 3( x2 + 2xy + y2 - z2 ) = 3[ ( x2 + 2xy + y2 ) - z2 ] = 3[ ( x + y )2 - z2 ] = 3( x + y - z )( x + y + z )
d) ab( x2 + y2 ) + xy( a2 + b2 ) = abx2 + aby2 + a2xy + b2xy
= ( a2xy + abx2 ) + ( aby2 + b2xy )
= ax( ay + bx ) + by( ay + bx )
= ( ay + bx )( ax + by )
a) \(3x^2-6xy+3y^2-12z^2\Leftrightarrow3\left(\left(x^2-2xy+y^2\right)-\left(2z\right)^2\right)\Leftrightarrow3\left(x-y\right)^2-\left(2z\right)^2\) \(\Leftrightarrow3\left(\left(x-y-2z\right)\left(x-y+2z\right)\right)\)
b) \(x^4+1-2x^2=\left(x^2\right)^2-2x^2+1^2=\left(x^2-1\right)^2\)
**** mik nha bn